java蓝牙当前电池百分比

Question

你好！我能成功地连接到GATT服务吗？我做到了：

public override void OnServicesDiscovered(BluetoothGatt Gatt, [GeneratedEnum] GattStatus Status)
        {
            base.OnServicesDiscovered(Gatt, Status);

            if (Status == GattStatus.Success)
            {
                 if(Service.Uuid.Equals(UUID.FromString("0000180f-0000-1000-8000-00805f9b34fb")))
                    {
                        BluetoothGattCharacteristic characteristic = Service.GetCharacteristic(UUID.FromString("00002a19-0000-1000-8000-00805f9b34fb"));
                        if(characteristic!=null)
                        {
                            Gatt.ReadCharacteristic(characteristic);
                        }

                    }
                }
            }
            else
            {
                MainActivity.AppendLog("onServicesDiscovered received: " + Status);
            }
        }

然后，阅读

    public override void OnCharacteristicRead(BluetoothGatt Gatt, BluetoothGattCharacteristic Characteristic, [GeneratedEnum] GattStatus Status)
    {
        base.OnCharacteristicRead(Gatt, Characteristic, Status);

        var batteryData = Characteristic.GetValue();
    }

我只得到77，这不是电池百分比（0-64）。设备总是发送这个号码，我试着给设备充电并等待低电量的电池，但总是收到这个号码。谢谢你的帮助